Imagine half of your userbase, especially almost every single new user onboarded this week, explicitly only wanted to trade on specific symbols, and you don't allow them to do so for 2-3 weeks (ACH settling period) at all.
Even if I believed this excuse, then RH is still greedy for signing up users they don't have the finances to support. They could've closed signups.
This was a lose/lose for them, new signups won’t stick around anyway now and they’re going to absolutely bleed existing users.